196 ESSAYS ann OBSERVATIONS 
things remain undifcovered in this vaft. field, 
_ which is but juft newly opened. 
As itis probable that the height which 
fome philofophers have afligned for the ftream- 
ers in the atmofphere, is. by feveral hundreds 
ef miles.too much; it were to be wifhed 
that people in various latitudes would care- 
fully obferve their altitude, at different times 
of the night; that, by comparing fimultane- 
ous obfervations, this matter may be deter- 
mined with more certainty. 
ART. 
